One must note that the above estimators for xα(δ)δ are the same as those that result from the minimization of ||Ax|| subject to Kx = y. In this case x = K(*)(KK(*))-1y where K(*) = (AA*)-1K* is found with respect to the inner product ⟨⟨x, y⟩⟩ = ⟨Ax, Ay⟩. This leads to the estimator,
